1,000,000,000 in Words
How do you write 1,000,000,000 in words?
The number 1,000,000,000 is written one billion in words. As an ordinal it is one billionth, and on a check you would write One billion and 00/100.
Last updated 24 August 2026
Other ways to write it
| Cardinal | one billion |
|---|---|
| Ordinal | one billionth |
| Currency | one billion dollars |
| Check format | One billion and 00/100 |
How 1,000,000,000 is written
1,000,000,000 occupies one place value, 1,000,000,000 in the billions place, and is written one billion.
Its ordinal form is one billionth — only the final element takes the ordinal ending — and on a check the amount line reads "One billion and 00/100", where 00/100 stands for zero cents.
One billion takes no "and" anywhere: the number has no tens or ones part for either dialect to join.
Roman numerals have no standard form above 3,999, so 1,000,000,000 has no Roman equivalent.
For house-style rules on spelling out numbers, see the Chicago Manual of Style.
Facts about 1,000,000,000
- 1,000,000,000 is an even number.
- It is not a prime number.
- Digit sum: 1.
- Binary: 111011100110101100101000000000.
- Hexadecimal: 3B9ACA00.
| Digit | Place |
|---|---|
| 1 | billions |
| 0 | hundred-millions |
| 0 | ten-millions |
| 0 | millions |
| 0 | hundred-thousands |
| 0 | ten-thousands |
| 0 | thousands |
| 0 | hundreds |
| 0 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 1,000,000,000 in words?
1,000,000,000 in words is "one billion".
How do you spell 1,000,000,000?
1,000,000,000 is spelled "one billion".
How do you write 1,000,000,000 on a check?
On a check, write "One billion and 00/100".